In cooperation with Nangang, we have developed fully standardized S355G, S355NL and S420ML series low temperature structural steel with full specification, low temperature and excellent welding quality and stable physical quality. It has been successfully applied to the EAST ANGLIA offshore wind power project and the world's largest liquefied natural gas project in the world, and has successfully implemented the "one belt and one road" and "ice silk road" initiative. It provides the guarantee of basic materials. The project won the second prize for scientific and technological progress in Jiangsu Province.